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The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.commons.io.serialization;

import java.util.regex.Pattern;

/**
 * A {@link ClassNameMatcher} that uses regular expressions.
 * 
 * This object is immutable and thread-safe.
 * 
 */
final class RegexpClassNameMatcher implements ClassNameMatcher {

    private final Pattern pattern; // Class is thread-safe

    /**
     * Constructs an object based on the specified regular expression.
     *
     * @param regex a regular expression for evaluating acceptable class names
     */
    public RegexpClassNameMatcher(final String regex) {
        this(Pattern.compile(regex));
    }

    /**
     * Constructs an object based on the specified pattern.
     *
     * @param pattern a pattern for evaluating acceptable class names
     * @throws IllegalArgumentException if pattern is null
     */
    public RegexpClassNameMatcher(final Pattern pattern) {
        if (pattern == null) {
            throw new IllegalArgumentException("Null pattern");
        }
        this.pattern = pattern;
    }

    @Override
    public boolean matches(final String className) {
        return pattern.matcher(className).matches();
    }
}